EP0082852A1 - Apparatus for extracting at least the inherent kinetic energy from waves. - Google Patents

Apparatus for extracting at least the inherent kinetic energy from waves.

Info

Publication number
EP0082852A1
EP0082852A1 EP82901874A EP82901874A EP0082852A1 EP 0082852 A1 EP0082852 A1 EP 0082852A1 EP 82901874 A EP82901874 A EP 82901874A EP 82901874 A EP82901874 A EP 82901874A EP 0082852 A1 EP0082852 A1 EP 0082852A1
Authority
EP
European Patent Office
Prior art keywords
intake
plane
waves
duct
water
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP82901874A
Other languages
German (de)
French (fr)
Other versions
EP0082852B1 (en
Inventor
Stig Arvid Henrikson
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of EP0082852A1 publication Critical patent/EP0082852A1/en
Application granted granted Critical
Publication of EP0082852B1 publication Critical patent/EP0082852B1/en
Expired legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03B—MACHINES OR ENGINES FOR LIQUIDS
    • F03B13/00—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates
    • F03B13/12—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates characterised by using wave or tide energy
    • F03B13/14—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates characterised by using wave or tide energy using wave energy
    • F03B13/141—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates characterised by using wave or tide energy using wave energy with a static energy collector
    • F03B13/144—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates characterised by using wave or tide energy using wave energy with a static energy collector which lifts water above sea level
    • F03B13/147—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates characterised by using wave or tide energy using wave energy with a static energy collector which lifts water above sea level for later use
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/30—Energy from the sea, e.g. using wave energy or salinity gradient

Definitions

  • the energy contained in a wave consists on one hand of the potential energy required to form the water surface and on the other hand the kinetic energy correspon ⁇ ding to the stun of the kinetic energies of the individual water particles when moving in circular paths.
  • the present invention relates to an apparatus for extracting at least the inherent kinetic energy from waves, characterized by comprising a coherent intake plane extending continuously from the intake side to the outtake side, along which plane the waves are to roll freely from the intake side to the outtake side and, provided at the outtake side of the intake plane, a depression which, via a sharp front edge of the intake plane, merges in a duct directed backwardly in such a way that the inherent kinetic energy of the waves is released in that the water particles traveliing forwards in the direction of the wave motion as well as those travelling backwards, which rotate in circular paths, are caused to flow in one direction through the duct which is connected to an energy converter, for instance a turbine.
  • an energy converter for instance a turbine
  • the kinetic, energy inherent in a wave consists more exactly, of particles which rotate in circular or deformed circular paths with the external diameter in the vertical sense equal to the height of the wave, i.e. the difference between wave crest and wave trough.
  • the speed of the wave in the horizontal sense of movement is con ⁇ siderably lower than the rotational speed of the water particles in the circular paths of the inherent energy.
  • the wave in a certain section has travelled up to the depression of the apparatus the wave drops vertically downwards while the rotating water particles of the in ⁇ herent energy in the circular paths are broken loose from their paths and are forced to change direction of movement at retained speed.
  • the apparatus is so designed that the changed movement of the water particles is caught and conducted via the duct to the energy con ⁇ verter.
  • the energy converter which preferably consists of a turbine.
  • the height of the steep depression of the apparatus is to be equal to or less than the radius of the circles situated on a wavelength and being about 8 in number. This applies to the size of an average wave measured on the coast area where the apparatus is to be placed. If the wave is larger than this average wave, the inherent energy in connection with the circulation centre will not be utilize ⁇ V but this gives only a rather slight loss of rotational energy.
  • the invention will"be described more fully with reference to the accompanying drawing which schematically shows an embodiment of the apparatus according to the invention.
  • Fig. 1 is a side view of the appa- ratus as seen in cross-section, submerged in water; and Fig. 2 is a top view of the apparatus.
  • the intake plane, designated 1 is coherent and extends continuously from the intake side 2 to the outtake side 3.
  • the waves are to roll freely along the intake plane 1 from the intake side 2 to the outtake side 3.
  • the depression 4 which, via a sharp front edge of the in ⁇ take plane 1, merges in the backwardly directed duct 5.
  • the duct 5 is provided with the energy converter consisting of a turbine or the like.
  • the intake plane 1 inclines upwards, as counted from the intake side 2, this inclination being at most 1:7. Via the sloping intake plane 1 the waves should be lifted no less than half the wave height, i.e.- at least corre ⁇ sponding to the radius r, which is the radius of the circular-cylindrical paths which the water particles describe during the movement of the waves.
  • the length of the inclined intake plane l. will thus be at least 7xr.
  • the width of the energy-producing part is B it is possible, by inclining the side edges 6 and 7 of the sloping intake plane 1 by an angular change of 1:7, as counted from the direction of movement of the waves, to increase the intake side 2 or the intake width for the waves to B+2xr, where the length of the intake plane 1 still is 7xr.
  • the side edges 6 and 7 converge towards the outtake side 3.
  • An assembly with the width B thus covers a length of B+2xr of the wave front.
  • the duct 5 with the energy converter extends ahead of the intake plane 1 as counted in ' the direction of movement of the. waves.
  • the duct 5 has a successivly diminishing section up to the energy converter, which means that the speed of the water body increases up to said converter.
  • the depression 4 situated after the outtake side 3 of the intake plane 1 has, as appears from the foregoing description, such a configuration that the backwardly moving water particles, situated under the centre of rota ⁇ tion, are taken care of during the circular-cylindrical movement and canalized in the same forward direction as those situated above the centre of rotation. This takes place in the duct 5.
  • the incoming water quantity diminishes to zero.
  • the intake suction is produced by the suction power arising after the water body from the immediately preceding wave crest has passed the system.
  • the flap 8 is adapted
  • OMPI to shut against the surrounding water when water will again flow into the duct 5, i.e. when the water body of the next wave crest flows into the system.
  • Canalization of potential energy as well as inherent kinetic energy will then take place at a time in the duct 5 up to somewhat above the level of the slack-water surface via e.g. a turbine and is discharged on the slack-water side of the apparatus.
  • the apparatus is adjustable so as to adapt itself to changes in the slack-water surface. Furthermore, the inclination of the intake plane 1 is adjustable so as to adapt itself to the wave height.
  • the outtake side 3 of the intake plane 1 is to lie on level with the slack- water surface at the back of the apparatus, or higher, while the intake side 2 of the intake plane 1 is to be on level with the wave trough.
  • the apparatus is mounted on floats or like means which preferably are applied leeward of the wave front so as to adapt itself to the slack-water surface on the*lee-side.
  • the sharp front edge of the intake plane 1 over which the wave drops down, is straight.
  • it may also be shaped in another way.
  • it may be bow-shaped.
  • the latter configuration may be used when it is a matter of catching the inherent energy of water particles moving in circular or elliptic paths because the movements do not exactly agree with the direction ⁇ f movement of the wave but at an angle thereto which is between 0 and 90°. These water particles will have a higher rotational speed than the particles moving in circular paths in the direction of movement of the wave.
  • the front edge in the intake plane 1 is curved, it is advisable to provide the intake plane 1 with the inclined side edges 6 and 7 which converge towards the outtake side 3 with the de ⁇ pression 4.
  • the invention is not limited to that described above and shown in the drawing but may be modified within the scope of the appended claims.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Other Liquid Machine Or Engine Such As Wave Power Use (AREA)

Abstract

Le dispositif comprend un plan d'admission cohérent (1) s'étendant en continu depuis le côté d'admission (2) jusqu'au côté de sorite (3), les vagues pouvant rouler librement sur ce plan d'admission depuis le côté d'admission (2) jusqu'au côté de sortie (3), et une dépression (4) est aménagée sur le côté de sortie (3) du plan d'admission (1), laquelle dépression, au travers des bords à arêtes vives du plan d'admission (1), se complètent d'une conduite (5) qui est dirigée vers l'arrière de sorte que l'énergie cinétique inhérente des ondes est libérée, étant donné que les particules d'eau se déplaçant vers l'avant en direction du mouvement de l'onde ainsi que celles se déplaçant vers l'arrière, qui tournent suivant des chemins circulaires, s'écoulent dans une direction au travers de la conduite (5). La conduite (5) est reliée à un convertisseur d'énergie.The device comprises a cohesive intake plane (1) extending continuously from the intake side (2) to the outlet side (3), the waves being able to freely roll over this intake plane from the side. inlet (2) to the outlet side (3), and a depression (4) is provided on the outlet side (3) of the inlet plane (1), which depression, through the ridged edges of the intake plane (1), complete with a pipe (5) which is directed backwards so that the inherent kinetic energy of the waves is released, as the water particles moving towards forward in the direction of wave movement as well as those moving backward, which rotate in circular paths, flow in one direction through the conduit (5). Line (5) is connected to an energy converter.

Description

APPARATUS FOR EXTRACTING AT LEAST THE INHERENT KINETIC ENERGY FROM WAVES
The energy contained in a wave consists on one hand of the potential energy required to form the water surface and on the other hand the kinetic energy correspon¬ ding to the stun of the kinetic energies of the individual water particles when moving in circular paths.
Thus the present invention relates to an apparatus for extracting at least the inherent kinetic energy from waves, characterized by comprising a coherent intake plane extending continuously from the intake side to the outtake side, along which plane the waves are to roll freely from the intake side to the outtake side and, provided at the outtake side of the intake plane, a depression which, via a sharp front edge of the intake plane, merges in a duct directed backwardly in such a way that the inherent kinetic energy of the waves is released in that the water particles traveliing forwards in the direction of the wave motion as well as those travelling backwards, which rotate in circular paths, are caused to flow in one direction through the duct which is connected to an energy converter, for instance a turbine.
The kinetic, energy inherent in a wave consists more exactly, of particles which rotate in circular or deformed circular paths with the external diameter in the vertical sense equal to the height of the wave, i.e. the difference between wave crest and wave trough. The speed of the wave in the horizontal sense of movement is con¬ siderably lower than the rotational speed of the water particles in the circular paths of the inherent energy.
When the wave in a certain section has travelled up to the depression of the apparatus the wave drops vertically downwards while the rotating water particles of the in¬ herent energy in the circular paths are broken loose from their paths and are forced to change direction of movement at retained speed. To this effect the apparatus is so designed that the changed movement of the water particles is caught and conducted via the duct to the energy con¬ verter. When the wave drops abruptly at the depression of the apparatus, specifically the inherent energy of the water particles moving backwards at the bottom of the circular movement is released and is accompanied by the particles travelling forwards and downwards at the top of the same circular movement and are all conducted to¬ wards the energy converter, which preferably consists of a turbine.
The height of the steep depression of the apparatus is to be equal to or less than the radius of the circles situated on a wavelength and being about 8 in number. This applies to the size of an average wave measured on the coast area where the apparatus is to be placed. If the wave is larger than this average wave, the inherent energy in connection with the circulation centre will not be utilizeάV but this gives only a rather slight loss of rotational energy. The invention will"be described more fully with reference to the accompanying drawing which schematically shows an embodiment of the apparatus according to the invention.
In the drawing, Fig. 1 is a side view of the appa- ratus as seen in cross-section, submerged in water; and Fig. 2 is a top view of the apparatus. The intake plane, designated 1, is coherent and extends continuously from the intake side 2 to the outtake side 3. The waves are to roll freely along the intake plane 1 from the intake side 2 to the outtake side 3. Provided at the outtake side 3 of the intake plane 1 is the depression 4 which, via a sharp front edge of the in¬ take plane 1, merges in the backwardly directed duct 5. The duct 5 is provided with the energy converter consisting of a turbine or the like.
The intake plane 1 inclines upwards, as counted from the intake side 2, this inclination being at most 1:7. Via the sloping intake plane 1 the waves should be lifted no less than half the wave height, i.e.- at least corre¬ sponding to the radius r, which is the radius of the circular-cylindrical paths which the water particles describe during the movement of the waves. The length of the inclined intake plane l.will thus be at least 7xr.
If the width of the energy-producing part is B it is possible, by inclining the side edges 6 and 7 of the sloping intake plane 1 by an angular change of 1:7, as counted from the direction of movement of the waves, to increase the intake side 2 or the intake width for the waves to B+2xr, where the length of the intake plane 1 still is 7xr. Thus the side edges 6 and 7 converge towards the outtake side 3. An assembly with the width B thus covers a length of B+2xr of the wave front.
As is apparent from the drawing the duct 5 with the energy converter extends ahead of the intake plane 1 as counted in' the direction of movement of the. waves. The duct 5 has a successivly diminishing section up to the energy converter, which means that the speed of the water body increases up to said converter.
The depression 4 situated after the outtake side 3 of the intake plane 1 has, as appears from the foregoing description, such a configuration that the backwardly moving water particles, situated under the centre of rota¬ tion, are taken care of during the circular-cylindrical movement and canalized in the same forward direction as those situated above the centre of rotation. This takes place in the duct 5. When a wave trough after the already passed wave crest arrives in the depression 4, the incoming water quantity diminishes to zero. Due to the outer water pressure around the duct 5 a flap 8 arranged in the duct 5 opens, whereby replacement water is sucked in. The intake suction is produced by the suction power arising after the water body from the immediately preceding wave crest has passed the system. Moreover, the flap 8 is adapted
OMPI to shut against the surrounding water when water will again flow into the duct 5, i.e. when the water body of the next wave crest flows into the system.
Canalization of potential energy as well as inherent kinetic energy will then take place at a time in the duct 5 up to somewhat above the level of the slack-water surface via e.g. a turbine and is discharged on the slack-water side of the apparatus.
The apparatus is adjustable so as to adapt itself to changes in the slack-water surface. Furthermore, the inclination of the intake plane 1 is adjustable so as to adapt itself to the wave height. Thus the outtake side 3 of the intake plane 1 is to lie on level with the slack- water surface at the back of the apparatus, or higher, while the intake side 2 of the intake plane 1 is to be on level with the wave trough.
In a preferred embodiment the apparatus is mounted on floats or like means which preferably are applied leeward of the wave front so as to adapt itself to the slack-water surface on the*lee-side.
According to the drawing the sharp front edge of the intake plane 1, over which the wave drops down, is straight. However, it may also be shaped in another way. Thus it may be bow-shaped. The latter configuration may be used when it is a matter of catching the inherent energy of water particles moving in circular or elliptic paths because the movements do not exactly agree with the direction σf movement of the wave but at an angle thereto which is between 0 and 90°. These water particles will have a higher rotational speed than the particles moving in circular paths in the direction of movement of the wave. Especially in this case, when the front edge in the intake plane 1 is curved, it is advisable to provide the intake plane 1 with the inclined side edges 6 and 7 which converge towards the outtake side 3 with the de¬ pression 4. The invention is not limited to that described above and shown in the drawing but may be modified within the scope of the appended claims.
OMPI

Claims

1. Apparatus for extracting the inherent kinetic energy from waves, characterized by comprising a coherent intake plane extending continuously from the intake side to the outtake side, along which plane the waves are to roll 5 freely from the -intake side to the outtake side and, pro¬ vided at the outtake side of the intake plane, a depression which, via a sharp front edge of the intake plane, merges in a duct directed backwardly in such a way that the in¬ herent kinetic energy of the waves is released in that the
10 water particles travelling forwards in the direction of the wave motion as well as those travelling backwards, which rotate in circular paths, are caused to flow in one direction through the duct which is connected to an energy converter, for instance a turbine. τ_5 2. Apparatus as claimed in claim 1, wherein the intake plane inclines upwards as counted from the intake side, the inclination of the intake plane being at most 1:7. .
3. Apparatus as claimed in claim 1 or 2, wherein the intake plane, especially when the sharp front edge of it
20 is curved, is provided with inclined side edges converging towards the outtake side.
4. Apparatus as claimed in any of claims 1-3, wherein the duct, which is intended to be in the water, is provided with a flap or the like which is adapted to open to the
25 surrounding water when suction arises in the duct.
5. Apparatus as claimed in claim , wherein the flap is adapted to shut against the surrounding water when water flows into the duct.
6. Apparatus as claimed in any of claims 1-5, which 30 is mounted on floats or like means leeward of the wave front so as to adapt itself to the slack-water surface on the lee-side.
7. Apparatus as claimed in claim 6, wherein the incli¬ nation of the intake plane is adjustable so as to adapt itself to the wave height.
8. Apparatus for extracting the inherent kinetic energy from waves, substantially as herein described with refer*- ence to, and as illustrated by. the accompanying drawing.
OMPI
EP82901874A 1981-06-25 1982-06-21 Apparatus for extracting at least the inherent kinetic energy from waves Expired EP0082852B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB08119599A GB2100806B (en) 1981-06-25 1981-06-25 Apparatus for extracting energy from water waves
GB8119599 1981-06-25

Publications (2)

Publication Number Publication Date
EP0082852A1 true EP0082852A1 (en) 1983-07-06
EP0082852B1 EP0082852B1 (en) 1986-04-02

Family

ID=10522794

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82901874A Expired EP0082852B1 (en) 1981-06-25 1982-06-21 Apparatus for extracting at least the inherent kinetic energy from waves

Country Status (6)

Country Link
US (1) US4521152A (en)
EP (1) EP0082852B1 (en)
JP (1) JPS58501003A (en)
CA (1) CA1184827A (en)
GB (1) GB2100806B (en)
WO (1) WO1983000058A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101506520B (en) * 2006-06-13 2011-12-07 C·S·卡特林 Ocean power harvester

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB8712078D0 (en) * 1987-05-21 1987-06-24 Henrikson Sa Recovering inherent kinetic energy from waves
DE4230789A1 (en) * 1992-09-15 1994-03-17 Schubert Werner Current generation plant using wind and wave energy - with breakwater and rotor supported at its rear edge for rotation by breakers and wind
DE69925474D1 (en) * 1998-03-26 2005-06-30 Waveplane Production As Gentof METHOD AND PUMP FOR MOVING WATER IN LARGE WATER VOLUMES
WO2000071891A1 (en) * 1999-05-26 2000-11-30 U.S. Myriad Technologies Floating wave energy converter
US20070081861A1 (en) * 2005-10-12 2007-04-12 Goble Rowland H Wave generator
US7586207B2 (en) * 2007-12-05 2009-09-08 Kinetic Wave Power Water wave power system
NO330474B1 (en) 2009-08-31 2011-04-26 Tidetec As Device for the extraction of tidal and bilge energy

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US1308649A (en) * 1919-07-01 Water-power plant
US1474571A (en) * 1919-09-03 1923-11-20 Wielgolaski Frans Henri Aubert Reaction turbine for water, wind, steam, etc.
US3644052A (en) * 1970-02-16 1972-02-22 William W Lininger Sea wave power generator
US3983404A (en) * 1974-08-22 1976-09-28 Sherrard William A Surf-turbine generating system
US4078871A (en) * 1974-09-16 1978-03-14 Perkins Jr Clifford A Sea wave energy conversion
FR2289763A1 (en) * 1974-10-31 1976-05-28 Bertin & Cie Sea swell energy extraction system - has hydraulic motors between housings with flap valves controlling water flow
US4137005A (en) * 1977-03-30 1979-01-30 Outdoor Enterprises Of America, Inc. Oceanic wave powered prime mover
US4179886A (en) * 1977-11-08 1979-12-25 Junjiro Tsubota Method and apparatus for obtaining useful work from wave energy
US4172689A (en) * 1977-12-14 1979-10-30 Ivar Thorsheim Wave power generator
US4263516A (en) * 1979-05-10 1981-04-21 Papadakis George M Breakwater and power generator
US4296602A (en) * 1980-01-10 1981-10-27 Hales Marwood J Apparatus for extracting energy from water waves

Non-Patent Citations (1)

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Title
See references of WO8300058A1 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101506520B (en) * 2006-06-13 2011-12-07 C·S·卡特林 Ocean power harvester

Also Published As

Publication number Publication date
JPS58501003A (en) 1983-06-23
EP0082852B1 (en) 1986-04-02
GB2100806B (en) 1985-01-23
GB2100806A (en) 1983-01-06
WO1983000058A1 (en) 1983-01-06
CA1184827A (en) 1985-04-02
US4521152A (en) 1985-06-04

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